4.6 Article

Correlation between linear resistivity and Tc in the Bechgaard salts and the pnictide superconductor Ba(Fe1-xCox)2As2

Journal

PHYSICAL REVIEW B
Volume 80, Issue 21, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.214531

Keywords

barium compounds; electrical resistivity; fluctuations in superconductors; high-temperature superconductors; iron compounds; organic superconductors; phase diagrams; proximity effect (superconductivity); spin density waves; spin fluctuations; superconducting transition temperature

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The quasi-one-dimensional organic Bechgaard salt (TMTSF)(2)PF6 displays spin-density-wave (SDW) order and superconductivity in close proximity in the temperature-pressure phase diagram. We have measured its normal-state electrical resistivity rho(a)(T) as a function of temperature and pressure, in the T -> 0 limit. At the critical pressure where SDW order disappears, rho(a)(T)proportional to T down to the lowest measured temperature (0.1 K). With increasing pressure, rho(a)(T) acquires a curvature that is well described by rho(a)(T)=rho(0)+AT+BT2, where the strength of the linear term, measured by the A coefficient, is found to scale with the superconducting transition temperature T-c. This correlation between A and T-c strongly suggests that scattering and pairing in (TMTSF)(2)PF6 have a common origin, most likely rooted in the antiferromagnetic spin fluctuations associated with SDW order. Analysis of published resistivity data on the iron-pnictide superconductor Ba(Fe1-xCox)(2)As-2 reveals a detailed similarity with (TMTSF)(2)PF6, suggesting that antiferromagnetic fluctuations play a similar role in the pnictides.

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